A polarized single crystal Raman study of the librational phonons in p-diiodobenzene

S. P. Cramer; B. Hudson; D. M. Burland

doi:10.1063/1.432302

A polarized single crystal Raman study of the librational phonons in p-diiodobenzene

S. P. Cramer, B. Hudson, D. M. Burland

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Abstract

Single crystal polarized Raman spectra of p-diiodobenzene in the region from 0 to 300 cm^-1 are presented for sample temperatures from 2 to 330 K. Eleven of the twelve predicted gerade librational phonons are unambiguously assigned in terms of their space group symmetries. The temperature dependence of the Raman spectra does not show a soft gerade phonon at the nearly second-order phase transition which occurs at 326 K. A significant anharmonicity for molecular motions above the I-I axis is indicated by the observation of overtones and combinations and broadening of these phonons as the temperature is raised from 2 K.

Original language	English (US)
Pages (from-to)	1140-1145
Number of pages	6
Journal	The Journal of Chemical Physics
Volume	64
Issue number	3
DOIs	https://doi.org/10.1063/1.432302
State	Published - 1976
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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10.1063/1.432302

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abstract = "Single crystal polarized Raman spectra of p-diiodobenzene in the region from 0 to 300 cm-1 are presented for sample temperatures from 2 to 330 K. Eleven of the twelve predicted gerade librational phonons are unambiguously assigned in terms of their space group symmetries. The temperature dependence of the Raman spectra does not show a soft gerade phonon at the nearly second-order phase transition which occurs at 326 K. A significant anharmonicity for molecular motions above the I-I axis is indicated by the observation of overtones and combinations and broadening of these phonons as the temperature is raised from 2 K.",

author = "Cramer, {S. P.} and B. Hudson and Burland, {D. M.}",

year = "1976",

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T1 - A polarized single crystal Raman study of the librational phonons in p-diiodobenzene

AU - Cramer, S. P.

AU - Hudson, B.

AU - Burland, D. M.

PY - 1976

Y1 - 1976

N2 - Single crystal polarized Raman spectra of p-diiodobenzene in the region from 0 to 300 cm-1 are presented for sample temperatures from 2 to 330 K. Eleven of the twelve predicted gerade librational phonons are unambiguously assigned in terms of their space group symmetries. The temperature dependence of the Raman spectra does not show a soft gerade phonon at the nearly second-order phase transition which occurs at 326 K. A significant anharmonicity for molecular motions above the I-I axis is indicated by the observation of overtones and combinations and broadening of these phonons as the temperature is raised from 2 K.

AB - Single crystal polarized Raman spectra of p-diiodobenzene in the region from 0 to 300 cm-1 are presented for sample temperatures from 2 to 330 K. Eleven of the twelve predicted gerade librational phonons are unambiguously assigned in terms of their space group symmetries. The temperature dependence of the Raman spectra does not show a soft gerade phonon at the nearly second-order phase transition which occurs at 326 K. A significant anharmonicity for molecular motions above the I-I axis is indicated by the observation of overtones and combinations and broadening of these phonons as the temperature is raised from 2 K.

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JO - The Journal of Chemical Physics

JF - The Journal of Chemical Physics

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ER -

A polarized single crystal Raman study of the librational phonons in p-diiodobenzene

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